"Only You" is a romantic comedy in the vein of "Forget Paris" or "French Kiss." The story gimmick here is as a young girl, Faith (Marisa Tomei) gets tricked into believing her destiny is to meet and marry Damon Bradley, and live happily ever after. Thinking he is in Italy, Faith and her friend Kate (Bonny Hunt) go to find him. She meets Peter (Robert Downey Jr.) who says he really is Damon Bradley. Although they hit it off, when she finds out his identity, she continues her search, the "destiny" thing.
So, Peter gets his friend (Billy Zane) to pretend he is the real Damon Bradley, act like a jerk, so that Faith will see Peter's love for her. The friend gets fresh with Faith, Peter has to intervene, the scam is exposed, Faith heads back for Boston in tears.
At the airport, both Faith and Peter hear a page for "damon Bradley", so they both go to see, and meet up with this nicely dressed businessman heading for a different European city. Peter goes off to his plane, Faith and Damon talk briefly, she realizes she loves Peter, she has them stop departure so she can get on, she and peter hug, the other travelers in the cabin applaud.
Not much new here, a cute little story told to entertain. Marisa Tomei became one of my favorite female actors in "My Cousin Vinny (92)", and she is good in anything. Robert Downey Jr, currently in and out of trouble for his drug problems, is one of the most talented male actors, and his prime supporting role is perfect. Billy Zane plays a goofy character, totally opposite from his "Titanic" character. Bonnie Hunt is always good as "the best friend next door" type of character.